CN209783610U - Photoelectric oscillator double-parameter sensing device based on dispersion compensation grating pair - Google Patents
Photoelectric oscillator double-parameter sensing device based on dispersion compensation grating pair Download PDFInfo
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Abstract
The device comprises a broadband light source, an optical comb filter, an electro-optical modulator, an optical beam splitter, a first circulator, a second circulator, a first dispersion compensation grating, a second dispersion compensation grating, an optical beam combiner, an optical fiber amplifier, a photoelectric detector, a microwave amplifier, a microwave power beam splitter and a signal processing module. The utility model adopts the dispersion compensation grating pair with the metal coating as a dispersion element and a sensing head at the same time, is used in a photoelectric oscillator, has small volume and compact structure, and is not easy to be influenced by environmental perturbation such as vibration and the like; the parameter information to be measured is mapped to an electric domain by using the photoelectric oscillator, the restriction relation between demodulation speed and resolution is broken, and high-resolution and high-speed temperature and axial stress double-parameter sensing can be realized.
Description
Technical Field
The utility model is suitable for a fiber sensing field and full gloss information processing field, concretely relates to photoelectric oscillator double parameter sensing device based on dispersion compensation grating is right.
Background
In the fields of oil wells, smart power grids, comprehensive underground pipe galleries, agriculture and the like, the sensor is used as a device for detecting and monitoring environmental parameters such as temperature, humidity and the like in a production environment, and plays an important role in the aspects of ensuring safe production and the like. Optical fiber sensors are favored for their stability, anti-electromagnetic interference, and other characteristics. Chinese patent application No. CN201810085724 proposes an optical fiber temperature sensor, which introduces an online mach zehnder interference structure and uses a spectrometer to realize temperature sensing demodulation, but since the spectrometer is used as demodulation equipment, demodulation speed and resolution cannot be both considered, and the demodulation speed is limited under the condition of meeting the requirement of high resolution. However, if the requirement of high-speed demodulation is satisfied, the resolution is limited. Therefore, a sensing scheme based on microwave photonics is proposed in succession, which also uses an optical fiber structure as a sensing head, but uses a spectrometer, a DSP, and other instruments to demodulate in an electrical domain, so as to realize sensing measurement with high resolution and high speed demodulation. In 2016, Wang Y et al proposed a Mach-Zehnder interferometer-based opto-electronic Oscillator Temperature Sensing scheme (Wang Y, Zhang J, Yao J. an Optoelectronic Oscillator for high Sensitivity Temperature Sensing [ J ] J]IEEE Photonics Technology Letters,2016,28(13):1-1.), but this scheme can only measure changes in a single physical quantity and cannot achieve dual parameter sensing. Similarly, Chen H et al have proposed in the same year a sensing demodulation scheme for fiber-optic interferometric sensors based on single-passband RF filters, which can be used for multi-point or multi-parameter sensing, by introducing a comb-shaped optical tap of a microwave photonic filter using an interferometer and observing the center frequency f of the RF bandpass filterfilterReading the variation of environmental parameters such as temperature (Chen H, Zhang S, Fu H, et al. sensing interference technique for fiber-optical interferometer type of sensors based on a single-pass band RF filter [ J H ]]Optics Express,2016,24(3):2765-
Where FSR is the free-range of the interferometer and β is the dispersion value of the link (ps/nm). When the output of the photoelectric detector in the structure is amplified and fed into the electro-optical modulator, a photoelectric oscillator can be formed, and the oscillation frequency is also determined by the formula (1). The schemes of Wang Y and Chen H both adopt Mach-Zehnder interferometers as sensing heads which are sensitive to polarization, susceptible to micro-vibration and the like, and can introduce unnecessary perturbation and system errors.
Disclosure of Invention
To the above-mentioned problem that current sensing, demodulation technique exist, the utility model provides a two parameter sensing devices of optoelectronic oscillator based on dispersion compensation grating is right for realize high resolution, fast-speed temperature and two parameter sensing of axial stress.
The technical scheme of the utility model: a photoelectric oscillator double-parameter sensing device based on a dispersion compensation grating pair is characterized in that: the device comprises a broadband light source, an optical comb filter, an electro-optic modulator, an optical beam splitter, a first circulator, a second circulator, a first dispersion compensation grating, a second dispersion compensation grating, an optical beam combiner, an optical fiber amplifier, a photoelectric detector, a microwave amplifier, a microwave power beam splitter and a signal processing module; the concrete connection mode is as follows:
The output end of the broadband light source is connected with the input end of the optical comb filter, the output end of the optical comb filter is connected with the optical input end of the electro-optical modulator, the optical output end of the electro-optical modulator is connected with the input end of the optical beam splitter, the first output end and the second output end of the optical beam splitter are respectively connected with the port a of the first circulator and the port a of the second circulator, the port b of the first circulator is connected with the input end of the first dispersion compensation grating, the port b of the second circulator is connected with the input end of the second dispersion compensation grating, the first input end and the second input end of the optical beam combiner are respectively connected with the port c of the first circulator and the port c of the second circulator, the output end of the optical beam combiner is connected with the input end of the optical fiber amplifier, the output end of the optical fiber amplifier is connected with the optical input end of the photoelectric detector, the electrical output end of the photoelectric detector is connected with the input, the first output end and the second output end of the microwave power beam splitter are respectively connected with the electric input end of the electric light modulator and the input end of the signal processing module.
The first dispersion compensation grating and the second dispersion compensation grating are chirped fiber gratings with metal coatings, which are used as a dispersion element and a sensing head in a photoelectric oscillator, so that the oscillation frequency is influenced by the dispersion value beta of the first dispersion compensation grating1And the dispersion value beta of the second dispersion compensation grating2Modulation; the first dispersion compensation grating is only acted by temperature, and the second dispersion compensation grating is acted by temperature and axial stress together and has beta1≠β2(ii) a The signal processing module is used for extracting the parameter information to be detected in real time.
The utility model discloses a concrete theory of operation as follows:
The broadband light source, the optical comb filter, the electro-optical modulator, the optical beam splitter, the circulator, the dispersion compensation grating, the optical beam combiner, the optical fiber amplifier, the photoelectric detector, the microwave amplifier and the microwave power beam splitter form a structure with an oscillation frequency f1the broadband light source, the optical comb filter, the electro-optical modulator, the optical beam splitter, the second circulator, the second dispersion compensation grating, the optical beam combiner, the optical fiber amplifier, the photoelectric detector, the microwave amplifier and the microwave power beam splitter form a structure with an oscillation frequency f2The optoelectronic oscillator of (1) has:
f1＝1/(FSR·β1) (2)
f2＝1/(FSR·β2) (3)
Where FSR is the free-range of the optical comb filter. The optical signals passing through the first dispersion compensation grating and the second dispersion compensation grating are combined and sent to the photoelectric detector. Due to the non-linear effect of the opto-electronic oscillator loop, the division results in a frequency f1And f2In addition to the signal (f), a beat frequency is generated with a frequency f3＝|f2-f1L radio frequency signal.
When the temperature of the chirped fiber grating with the metal coating changes, the metal coating expands under heat, so that the grating coated by the metal coating is subjected to axial stressCausing the dispersion value of the grating to vary linearly with temperature, i.e. the dispersion values beta of the first and second dispersion compensation gratings1And beta2both vary linearly with temperature. Further, f1And f2At the same time, modulated by temperature and introduced frequency drift amount delta f due to temperature change11And Δ f21Are equal. Dispersion-compensated grating number one is only affected by temperature, i.e. f1Amount of frequency drift of Δ f1Determined only by temperature, having Δ f1＝Δf11. The second dispersion compensation grating is under the action of external axial stress besides the action of temperature, namely f2Amount of frequency drift of Δ f2Determined by temperature and axial stress, has a value of2＝Δf21+Δf22Wherein Δ f22Is the amount of frequency drift introduced by axial stress. Thus, f3Amount of frequency drift of Δ f3Comprises the following steps:
Δf3＝|(Δf21+Δf22)-Δf11|＝Δf22 (4)
From this, f is3Modulated by axial stress only, f1Is modulated only by temperature and is read in real time by a signal processing module1And f3The numerical value of the temperature sensor can realize the sensing demodulation of the temperature and the axial stress.
the beneficial effects of the utility model are specifically as follows:
The utility model adopts the dispersion compensation grating pair with the metal coating, namely the chirped fiber grating pair with the metal coating, which is used as a dispersion element and a sensing head simultaneously and is used in a photoelectric oscillator, has small volume and compact structure, and is not easy to be influenced by environmental perturbation such as vibration and the like; the parameter information to be measured is mapped to an electric domain by using the photoelectric oscillator, the restriction relation between demodulation speed and resolution is broken, and high-resolution and high-speed temperature and axial stress double-parameter sensing can be realized.
Drawings
Fig. 1 is a schematic structural diagram of a photoelectric oscillator dual-parameter sensing device based on a dispersion compensation grating pair.
fig. 2 is a spectral response of an optical comb filter.
Wherein each icon is: the device comprises a broadband light source 1, an optical comb filter 2, an electro-optical modulator 3, an optical beam splitter 4, a first circulator 5, a second circulator 6, a first dispersion compensation grating 7, a second dispersion compensation grating 8, an optical beam combiner 9, an optical fiber amplifier 10, a photoelectric detector 11, a microwave amplifier 12, a microwave power beam splitter 13, a signal processing module 14, a first output end 41 of the optical beam splitter, a second output end 42 of the optical beam splitter, a first circulator a port 51, a first circulator b port 52, a first circulator c port 53, a second circulator a port 61, a second circulator b port 62, a second circulator c port 63, a first input end 91 of the optical beam combiner, a second input end 92 of the optical beam combiner, a first output end 131 of the microwave power beam splitter and a second output end 132 of the microwave power beam splitter.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below by referring to the drawings are exemplary only for explaining the present invention, and should not be construed as limiting the present invention.
Example one
A dispersion compensation grating pair-based photoelectric oscillator double-parameter sensing device is shown in fig. 1 and comprises a broadband light source 1, an optical comb filter 2, an electro-optic modulator 3, an optical beam splitter 4, a first circulator 5, a second circulator 6, a first dispersion compensation grating 7, a second dispersion compensation grating 8, an optical beam combiner 9, an optical fiber amplifier 10, a photoelectric detector 11, a microwave amplifier 12, a microwave power beam splitter 13 and a signal processing module 14; the concrete connection mode is as follows:
The output end of a broadband light source 1 is connected with the input end of an optical comb filter 2, the output end of the optical comb filter 2 is connected with the optical input end of an optical modulator 3, the optical output end of the electro-optical modulator 3 is connected with the input end of an optical beam splitter 4, a first output end 41 and a second output end 42 of the optical beam splitter 4 are respectively connected with an a port 51 of a first circulator 5 and an a port 61 of a second circulator 6, a b port 52 of the first circulator 5 is connected with the input end of a first dispersion compensation grating 7, a b port 62 of the second circulator 6 is connected with the input end of a second dispersion compensation grating 8, a first input end 91 and a second input end 92 of an optical combiner 9 are respectively connected with a c port 53 of the first circulator 5 and a c port 63 of the second circulator 6, the output end of the optical beam combiner 9 is connected with the input end of an optical fiber amplifier 10, the output end of the optical fiber amplifier 10 is connected with the optical input, the electrical output end of the photodetector 11 is connected to the input end of the microwave amplifier 12, the output end of the microwave amplifier 12 is connected to the input end of the microwave power splitter 13, and the first output end 131 and the second output end 132 of the microwave power splitter 13 are respectively connected to the electrical input end of the electro-optical modulator 3 and the input end of the signal processing module 14.
The first dispersion compensation grating 7 and the second dispersion compensation grating 8 are chirped fiber gratings with aluminum coatings, which are used as a dispersion element and a sensing head in a photoelectric oscillator, so that the oscillation frequency is influenced by the dispersion value beta of the first dispersion compensation grating 71And the dispersion value beta of the second dispersion compensation grating 82Modulation; the first dispersion compensation grating 7 is only acted by temperature, and the second dispersion compensation grating 8 is acted by temperature and axial stress together; the signal processing module 14 is used for extracting the parameter information to be measured in real time.
Broad band light source 1 for providing C&An optical signal in the L-band; the spectral response of the optical comb filter 2 is shown in fig. 2, with an FSR of 2 nm; the electro-optical modulator 3 is a phase modulator; dispersion value beta of first dispersion compensation grating 71And the 3dB bandwidth of the reflection spectrum is 300ps/nm and 35nm respectively; dispersion value beta of second dispersion compensation grating 82And the 3dB bandwidth of the reflection spectrum is 100ps/nm and 35nm respectively.
Due to radio-frequency signals f generated by opto-electronic oscillators1、f2And f3In, f3Modulated by axial stress only, f1Is modulated only by temperature and is read in real time by the signal processing module 141and f3The numerical value of the temperature sensor can realize the sensing demodulation of the temperature and the axial stress.
Example two
A dispersion compensation grating pair-based photoelectric oscillator double-parameter sensing device is shown in fig. 1 and comprises a broadband light source 1, an optical comb filter 2, an electro-optic modulator 3, an optical beam splitter 4, a first circulator 5, a second circulator 6, a first dispersion compensation grating 7, a second dispersion compensation grating 8, an optical beam combiner 9, an optical fiber amplifier 10, a photoelectric detector 11, a microwave amplifier 12, a microwave power beam splitter 13 and a signal processing module 14; the concrete connection mode is as follows:
The output end of a broadband light source 1 is connected with the input end of an optical comb filter 2, the output end of the optical comb filter 2 is connected with the optical input end of an optical modulator 3, the optical output end of the electro-optical modulator 3 is connected with the input end of an optical beam splitter 4, a first output end 41 and a second output end 42 of the optical beam splitter 4 are respectively connected with an a port 51 of a first circulator 5 and an a port 61 of a second circulator 6, a b port 52 of the first circulator 5 is connected with the input end of a first dispersion compensation grating 7, a b port 62 of the second circulator 6 is connected with the input end of a second dispersion compensation grating 8, a first input end 91 and a second input end 92 of an optical combiner 9 are respectively connected with a c port 53 of the first circulator 5 and a c port 63 of the second circulator 6, the output end of the optical beam combiner 9 is connected with the input end of an optical fiber amplifier 10, the output end of the optical fiber amplifier 10 is connected with the optical input, the electrical output end of the photodetector 11 is connected to the input end of the microwave amplifier 12, the output end of the microwave amplifier 12 is connected to the input end of the microwave power splitter 13, and the first output end 131 and the second output end 132 of the microwave power splitter 13 are respectively connected to the electrical input end of the electro-optical modulator 3 and the input end of the signal processing module 14.
The first dispersion compensation grating 7 and the second dispersion compensation grating 8 are chirped fiber gratings with copper coatings, which are used as a dispersion element and a sensing head in a photoelectric oscillator, so that the oscillation frequency is influenced by the dispersion value beta of the first dispersion compensation grating 71And the dispersion value beta of the second dispersion compensation grating 82Modulation; the first dispersion compensation grating 7 is only acted by temperature, and the second dispersion compensation grating 8 is acted by temperature and axial stress together; the signal processing module 14 is used for extracting the parameter information to be measured in real time.
Broad band light source 1 for providing C&An optical signal in the L-band; the spectral response of the optical comb filter 2 is shown in fig. 2, with an FSR of 1 nm; the electro-optical modulator 3 is a phase modulator; first order dispersionCompensating the dispersion value beta of the grating 71And the 3dB bandwidth of the reflection spectrum is 520ps/nm and 20nm respectively; dispersion value beta of second dispersion compensation grating 82And the 3dB bandwidth of the reflection spectrum is 300ps/nm and 20nm respectively.
Due to radio-frequency signals f generated by opto-electronic oscillators1、f2And f3In, f3Modulated by axial stress only, f1Is modulated only by temperature and is read in real time by the signal processing module 141And f3The numerical value of the temperature sensor can realize the sensing demodulation of the temperature and the axial stress.
EXAMPLE III
A dispersion compensation grating pair-based photoelectric oscillator double-parameter sensing device is shown in fig. 1 and comprises a broadband light source 1, an optical comb filter 2, an electro-optic modulator 3, an optical beam splitter 4, a first circulator 5, a second circulator 6, a first dispersion compensation grating 7, a second dispersion compensation grating 8, an optical beam combiner 9, an optical fiber amplifier 10, a photoelectric detector 11, a microwave amplifier 12, a microwave power beam splitter 13 and a signal processing module 14; the concrete connection mode is as follows:
The output end of a broadband light source 1 is connected with the input end of an optical comb filter 2, the output end of the optical comb filter 2 is connected with the optical input end of an optical modulator 3, the optical output end of the electro-optical modulator 3 is connected with the input end of an optical beam splitter 4, a first output end 41 and a second output end 42 of the optical beam splitter 4 are respectively connected with an a port 51 of a first circulator 5 and an a port 61 of a second circulator 6, a b port 52 of the first circulator 5 is connected with the input end of a first dispersion compensation grating 7, a b port 62 of the second circulator 6 is connected with the input end of a second dispersion compensation grating 8, a first input end 91 and a second input end 92 of an optical combiner 9 are respectively connected with a c port 53 of the first circulator 5 and a c port 63 of the second circulator 6, the output end of the optical beam combiner 9 is connected with the input end of an optical fiber amplifier 10, the output end of the optical fiber amplifier 10 is connected with the optical input, the electrical output end of the photodetector 11 is connected to the input end of the microwave amplifier 12, the output end of the microwave amplifier 12 is connected to the input end of the microwave power splitter 13, and the first output end 131 and the second output end 132 of the microwave power splitter 13 are respectively connected to the electrical input end of the electro-optical modulator 3 and the input end of the signal processing module 14.
The first dispersion compensation grating 7 and the second dispersion compensation grating 8 are chirped fiber gratings with nickel coatings, which are used as a dispersion element and a sensing head in a photoelectric oscillator, so that the oscillation frequency is influenced by the dispersion value beta of the first dispersion compensation grating 71And the dispersion value beta of the second dispersion compensation grating 82Modulation; the first dispersion compensation grating 7 is only acted by temperature, and the second dispersion compensation grating 8 is acted by temperature and axial stress together; the signal processing module 14 is used for extracting the parameter information to be measured in real time.
The broadband light source 1 is used for providing optical signals in an O waveband; the spectral response of the optical comb filter 2 is shown in fig. 2, with an FSR of 0.1 nm; the electro-optical modulator 3 is a Mach-Zehnder intensity modulator and works at an orthogonal bias point; dispersion value beta of first dispersion compensation grating 71and the 3dB bandwidth of the reflection spectrum is 1400ps/nm and 15nm respectively; dispersion value beta of second dispersion compensation grating 82And the 3dB bandwidth of the reflection spectrum is 700ps/nm and 15nm respectively.
Due to radio-frequency signals f generated by opto-electronic oscillators1、f2And f3In, f3Modulated by axial stress only, f1Is modulated only by temperature and is read in real time by the signal processing module 141and f3The numerical value of the temperature sensor can realize the sensing demodulation of the temperature and the axial stress.
Example four
A dispersion compensation grating pair-based photoelectric oscillator double-parameter sensing device is shown in fig. 1 and comprises a broadband light source 1, an optical comb filter 2, an electro-optic modulator 3, an optical beam splitter 4, a first circulator 5, a second circulator 6, a first dispersion compensation grating 7, a second dispersion compensation grating 8, an optical beam combiner 9, an optical fiber amplifier 10, a photoelectric detector 11, a microwave amplifier 12, a microwave power beam splitter 13 and a signal processing module 14; the concrete connection mode is as follows:
the output end of a broadband light source 1 is connected with the input end of an optical comb filter 2, the output end of the optical comb filter 2 is connected with the optical input end of an optical modulator 3, the optical output end of the electro-optical modulator 3 is connected with the input end of an optical beam splitter 4, a first output end 41 and a second output end 42 of the optical beam splitter 4 are respectively connected with an a port 51 of a first circulator 5 and an a port 61 of a second circulator 6, a b port 52 of the first circulator 5 is connected with the input end of a first dispersion compensation grating 7, a b port 62 of the second circulator 6 is connected with the input end of a second dispersion compensation grating 8, a first input end 91 and a second input end 92 of an optical combiner 9 are respectively connected with a c port 53 of the first circulator 5 and a c port 63 of the second circulator 6, the output end of the optical beam combiner 9 is connected with the input end of an optical fiber amplifier 10, the output end of the optical fiber amplifier 10 is connected with the optical input, the electrical output end of the photodetector 11 is connected to the input end of the microwave amplifier 12, the output end of the microwave amplifier 12 is connected to the input end of the microwave power splitter 13, and the first output end 131 and the second output end 132 of the microwave power splitter 13 are respectively connected to the electrical input end of the electro-optical modulator 3 and the input end of the signal processing module 14.
The first dispersion compensation grating 7 and the second dispersion compensation grating 8 are chirped fiber gratings with copper coatings, which are used as a dispersion element and a sensing head in a photoelectric oscillator, so that the oscillation frequency is influenced by the dispersion value beta of the first dispersion compensation grating 71And the dispersion value beta of the second dispersion compensation grating 82Modulation; the first dispersion compensation grating 7 is only acted by temperature, and the second dispersion compensation grating 8 is acted by temperature and axial stress together; the signal processing module 14 is used for extracting the parameter information to be measured in real time.
The broadband light source 1 is used for providing an optical signal in an L waveband; the spectral response of the optical comb filter 2 is shown in fig. 2, with an FSR of 0.08 nm; the electro-optical modulator 3 is a Mach-Zehnder intensity modulator and works at an orthogonal bias point; dispersion value beta of first dispersion compensation grating 71And the 3dB bandwidth of the reflection spectrum is 1650ps/nm and 10nm respectively; dispersion value beta of second dispersion compensation grating 82and a reflection spectrum 3dB bandwidth of 1030ps/nm and 10nm respectively.
Due to radio-frequency signals f generated by opto-electronic oscillators1、f2And f3In, f3Modulated by axial stress only, f1Is modulated only by temperature and is read in real time by the signal processing module 141And f3The numerical value of the temperature sensor can realize the sensing demodulation of the temperature and the axial stress.
EXAMPLE five
A dispersion compensation grating pair-based photoelectric oscillator double-parameter sensing device is shown in fig. 1 and comprises a broadband light source 1, an optical comb filter 2, an electro-optic modulator 3, an optical beam splitter 4, a first circulator 5, a second circulator 6, a first dispersion compensation grating 7, a second dispersion compensation grating 8, an optical beam combiner 9, an optical fiber amplifier 10, a photoelectric detector 11, a microwave amplifier 12, a microwave power beam splitter 13 and a signal processing module 14; the concrete connection mode is as follows:
The output end of a broadband light source 1 is connected with the input end of an optical comb filter 2, the output end of the optical comb filter 2 is connected with the optical input end of an optical modulator 3, the optical output end of the electro-optical modulator 3 is connected with the input end of an optical beam splitter 4, a first output end 41 and a second output end 42 of the optical beam splitter 4 are respectively connected with an a port 51 of a first circulator 5 and an a port 61 of a second circulator 6, a b port 52 of the first circulator 5 is connected with the input end of a first dispersion compensation grating 7, a b port 62 of the second circulator 6 is connected with the input end of a second dispersion compensation grating 8, a first input end 91 and a second input end 92 of an optical combiner 9 are respectively connected with a c port 53 of the first circulator 5 and a c port 63 of the second circulator 6, the output end of the optical beam combiner 9 is connected with the input end of an optical fiber amplifier 10, the output end of the optical fiber amplifier 10 is connected with the optical input, the electrical output end of the photodetector 11 is connected to the input end of the microwave amplifier 12, the output end of the microwave amplifier 12 is connected to the input end of the microwave power splitter 13, and the first output end 131 and the second output end 132 of the microwave power splitter 13 are respectively connected to the electrical input end of the electro-optical modulator 3 and the input end of the signal processing module 14.
The first dispersion compensation grating 7 and the second dispersion compensation grating 8 are chirped fiber gratings with copper coatings, which are used as a dispersion element and a sensing head in a photoelectric oscillator, so that the oscillation frequency is influenced by the dispersion value beta of the first dispersion compensation grating 71And the dispersion value beta of the second dispersion compensation grating 82Modulation; the first dispersion compensation grating 7 is only acted by temperature, and the second dispersion compensation grating 8 is acted by temperature and axial stress together; the signal processing module 14 is used for extracting the parameter information to be measured in real time.
Broad band light source 1 for liftingSupplying an optical signal of an L wave band; the spectral response of the optical comb filter 2 is shown in fig. 2, with an FSR of 0.07 nm; the electro-optical modulator 3 is a Mach-Zehnder intensity modulator and works at an orthogonal bias point; dispersion value beta of first dispersion compensation grating 71And the 3dB bandwidth of the reflection spectrum is-1650 ps/nm and 5nm respectively; dispersion value beta of second dispersion compensation grating 82And the 3dB bandwidth of the reflection spectrum is-1030 ps/nm and 5nm respectively.
due to radio-frequency signals f generated by opto-electronic oscillators1、f2and f3In, f3Modulated by axial stress only, f1Is modulated only by temperature and is read in real time by the signal processing module 141And f3The numerical value of the temperature sensor can realize the sensing demodulation of the temperature and the axial stress.
Claims (2)
1. A photoelectric oscillator double-parameter sensing device based on a dispersion compensation grating pair is used for temperature and axial stress double-parameter sensing and is characterized in that: the device comprises a broadband light source (1), an optical comb filter (2), an electro-optic modulator (3), an optical beam splitter (4), a first circulator (5), a second circulator (6), a first dispersion compensation grating (7), a second dispersion compensation grating (8), an optical beam combiner (9), an optical fiber amplifier (10), a photoelectric detector (11), a microwave amplifier (12), a microwave power beam splitter (13) and a signal processing module (14); the concrete connection mode is as follows:
The output end of a broadband light source (1) is connected with the input end of an optical comb filter (2), the output end of the optical comb filter (2) is connected with the optical input end of an optical modulator (3), the optical output end of the electro-optical modulator (3) is connected with the input end of an optical beam splitter (4), a first output end (41) and a second output end (42) of the optical beam splitter (4) are respectively connected with an a port (51) of a first circulator (5) and an a port (61) of a second circulator (6), a b port (52) of the first circulator (5) is connected with the input end of a first dispersion compensation grating (7), a b port (62) of the second circulator (6) is connected with the input end of a second dispersion compensation grating (8), a first input end (91) and a second input end (92) of an optical beam combiner (9) are respectively connected with a c port (53) of the first circulator (5) and a c port (63) of the second circulator (6), the output end of the optical combiner (9) is connected with the input end of an optical fiber amplifier (10), the output end of the optical fiber amplifier (10) is connected with the optical input end of a photoelectric detector (11), the electrical output end of the photoelectric detector (11) is connected with the input end of a microwave amplifier (12), the output end of the microwave amplifier (12) is connected with the input end of a microwave power beam splitter (13), and a first output end (131) and a second output end (132) of the microwave power beam splitter (13) are respectively connected with the electrical input end of the optical modulator (3) and the input end of a signal processing module (14).
2. The dispersion compensated grating pair-based opto-electronic oscillator dual parameter sensing apparatus of claim 1, wherein: the first dispersion compensation grating (7) and the second dispersion compensation grating (8) are chirped fiber gratings with metal coatings, which are used as a dispersion element and a sensing head in a photoelectric oscillator, so that the oscillation frequency is influenced by the dispersion value beta of the first dispersion compensation grating (7)1And the dispersion value beta of the second dispersion compensation grating (8)2Modulation; the first dispersion compensation grating (7) is only acted by temperature, and the second dispersion compensation grating (8) is acted by temperature and axial stress together and has beta1≠β2(ii) a The signal processing module (14) is used for extracting the parameter information to be measured in real time.
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| CN112910557A (en) * | 2021-01-14 | 2021-06-04 | 清华大学 | Dispersion compensation method, device and system for long-distance frequency transmission |
| CN113839297A (en) * | 2021-09-08 | 2021-12-24 | 电子科技大学 | Photoelectric oscillator based on injection locking effect |
| CN114739436A (en) * | 2022-04-12 | 2022-07-12 | 南京航空航天大学 | Multi-parameter optical fiber sensing method and device based on photoelectric oscillation loop |
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| CN112910557A (en) * | 2021-01-14 | 2021-06-04 | 清华大学 | Dispersion compensation method, device and system for long-distance frequency transmission |
| CN113839297A (en) * | 2021-09-08 | 2021-12-24 | 电子科技大学 | Photoelectric oscillator based on injection locking effect |
| CN114739436A (en) * | 2022-04-12 | 2022-07-12 | 南京航空航天大学 | Multi-parameter optical fiber sensing method and device based on photoelectric oscillation loop |
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